Reasons for increased fluidized bed resistance and high silica gel consumption in melamine production
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A factory uses a two-step process to produce melamine. Five months after the overhaul, the resistance of the fluidized bed increased and the consumption of silica gel increased. Please participate in the discussion of the reasons and countermeasures for this situation.
In the two-step production of triamine, the phenomenon you mentioned occurred when we used the reactor for many years, and salt leakage occurred from the salt pipe of the reactor.
It should be that the fluidized bed has a local dead bed phenomenon, the circulation area becomes smaller, and the resistance is large.； The local flow rate is high, the silica gel is seriously worn, and the broken pieces are taken out of the reactor. The cause may be salt leakage from the salt pipe, system steam, poor urine spray from the urine nozzle, etc.:handshake: What handshake said may not be correct, it is for reference only!
If the resistance of the fluidized bed is large, it may be that the filter net is clogged. The high consumption of silica gel may be caused by the poor water removal effect of the carrier gas, which causes the silica gel to break. You can take a sample to make a stack ratio of silica gel, or it may be caused by the blockage of the cyclone feed leg in the fluidized bed. You can check it one by one, for reference only.
The large fluidized bed uses a cyclone separator. I don’t know whether the resistance of the poster is the distributor or the bed layer. The resistance of the fluidized bed is related to the height of the catalyst, and is a fixed value. If the resistance of the distributor is large, the feed amount can be reduced or the distributor can be recalibrated.
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It should be that there are many products attached to the reactor and the wall is seriously formed. The cyclone separator legs need to be inspected.